<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        .dropbtn{
            background-color: #4caf50;
            color: #ffffff;
            padding: 16px;
            font-size: 16px;
            border: none;
            cursor: pointer;
        }

        .dropdown{
            position: relative;;display: inline-block;
        }

        .dropdown-content{
            display: none;
            position: absolute;
            background-color: #f9f9f9;
            min-width: 160px;
            box-shadow:  0px 8px 16px 0px rgba(0,0,0,0.2);
        }
        .dropdown-content a{
            color: #000000;
            padding: 12px 16px;
            text-decoration: none;
            display: block;
        }
        .dropdown-content a:hover{background-color: #f1f1f1}
        .dropdown:hover .dropdown-content{
            display: block;
        }
        .dropdown:hover .dropbtn{
            background-color: #3e8e41;
        }
    </style>
</head>
<body>
	<div class="dropdown">
		<button class="dropbtn">下拉菜单</button>
		<div class="dropdown-content">
			<a href="#">下拉菜单 1</a>
			<a href="#">下拉菜单 2</a>
			<a href="#">下拉菜单 3</a>
		</div>
	</div>
</body>
</html>